Instapage Form GTM Event Listener

Instapage Form

Overview

Instapage is a landing page builder popular with PPC advertisers. It exposes a global callback function window.instapageFormSubmitSuccess that fires after a successful form submission. This listener defines that callback to push a formSubmissionSuccess event to the GTM dataLayer.

Event fired: formSubmissionSuccess

Limitation: May not work on all Instapage forms, particularly when multiple forms exist on one page. In that case, use GTM's built-in Form Trigger.

Common Use Cases

• Track PPC landing page form conversions
• Fire Google Ads conversion tags on Instapage form submission
• Import Instapage conversions into GA4 for attribution
• Build retargeting audiences from Instapage form submitters

Installation

<!-- GTM Custom HTML Tag: Instapage Form Listener -->
<script>
window.instapageFormSubmitSuccess = function(form) {
  window.dataLayer = window.dataLayer || [];
  window.dataLayer.push({
    'event': 'formSubmissionSuccess'
  });
  console.log('Instapage form submitted');
};
</script>

Fire on: DOM Ready. Must be placed before Instapage's own scripts load.

Data Layer Output

{
  "event": "formSubmissionSuccess"
}

Trigger Configuration

Note: If you also use Gravity Forms with formSubmissionSuccess, differentiate by using page URL conditions in the trigger.

GA4 Mapping

Debugging

Privacy Compliance Tips

Use trigger conditions to limit tracking to specific pages (e.g., /landing-*), and add consent checks before pushing to the dataLayer.

Related Listeners

• Unbounce Form
• Webflow Form